Handheld electronic device and method for learning contextual data during disambiguation of text input

ABSTRACT

A handheld electronic device includes a reduced QWERTY keyboard and is enabled with disambiguation software that is operable to disambiguate text input. In addition to identifying and outputting representations of language objects that are stored in the memory and that correspond with a text input, the device is able to employ contextual data in certain circumstances to prioritize output and to learn new contextual data.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority from and claims the benefit of U.S. patent application Ser. No. 11/399,271 filed Apr. 6, 2006, the disclosures of which are incorporated herein by reference.

BACKGROUND

1. Field

The disclosed and claimed concept relates generally to handheld electronic devices and, more particularly, to a handheld electronic device having a reduced keyboard and a text input disambiguation function that can employ contextual data.

2. Background Information

Numerous types of handheld electronic devices are known. Examples of such handheld electronic devices include, for instance, personal data assistants (PDAs), handheld computers, two-way pagers, cellular telephones, and the like. Many handheld electronic devices also feature wireless communication capability, although many such handheld electronic devices are stand-alone devices that are functional without communication with other devices.

Such handheld electronic devices are generally intended to be portable, and thus are of a relatively compact configuration in which keys and other input structures often perform multiple functions under certain circumstances or may otherwise have multiple aspects or features assigned thereto. With advances in technology, handheld electronic devices are built to have progressively smaller form factors yet have progressively greater numbers of applications and features resident thereon. As a practical matter, the keys of a keypad can only be reduced to a certain small size before the keys become relatively unusable. In order to enable text entry, however, a keypad must be capable of entering all twenty-six letters of the Latin alphabet, for instance, as well as appropriate punctuation and other symbols.

One way of providing numerous letters in a small space has been to provide a “reduced keyboard” in which multiple letters, symbols, and/or digits, and the like, are assigned to any given key. For example, a touch-tone telephone includes a reduced keypad by providing twelve keys, of which ten have digits thereon, and of these ten keys eight have Latin letters assigned thereto. For instance, one of the keys includes the digit “2” as well as the letters “A”, “B”, and “C”. Other known reduced keyboards have included other arrangements of keys, letters, symbols, digits, and the like. Since a single actuation of such a key potentially could be intended by the user to refer to any of the letters “A”, “B”, and “C”, and potentially could also be intended to refer to the digit “2”, the input generally is an ambiguous input and is in need of some type of disambiguation in order to be useful for text entry purposes.

In order to enable a user to make use of the multiple letters, digits, and the like on any given key, numerous keystroke interpretation systems have been provided. For instance, a “multi-tap” system allows a user to substantially unambiguously specify a particular character on a key by pressing the same key a number of times equivalent to the position of the desired character on the key. Another exemplary keystroke interpretation system would include key chording, of which various types exist. For instance, a particular character can be entered by pressing two keys in succession or by pressing and holding first key while pressing a second key. Still another exemplary keystroke interpretation system would be a “press-and-hold/press-and-release” interpretation function in which a given key provides a first result if the key is pressed and immediately released, and provides a second result if the key is pressed and held for a short period of time. Another keystroke interpretation system that has been employed is a software-based text disambiguation function. In such a system, a user typically presses keys to which one or more characters have been assigned, generally pressing each key one time for each desired letter, and the disambiguation software attempt to predict the intended input. Numerous such systems have been proposed, and while many have been generally effective for their intended purposes, shortcomings still exist.

It would be desirable to provide an improved handheld electronic device with a reduced keyboard that seeks to mimic a QWERTY keyboard experience or other particular keyboard experience. Such an improved handheld electronic device might also desirably be configured with enough features to enable text entry and other tasks with relative ease.

BRIEF DESCRIPTION OF THE DRAWINGS

A full understanding of the disclosed and claimed concept can be gained from the following Description when read in conjunction with the accompanying drawings in which:

FIG. 1 is a top plan view of an improved handheld electronic device in accordance with the disclosed and claimed concept;

FIG. 2 is a schematic depiction of the improved handheld electronic device of FIG. 1;

FIG. 2A is a schematic depiction of a portion of the handheld electronic device of FIG. 2;

FIGS. 3A, 3B, and 3C are an exemplary flowchart depicting certain aspects of a disambiguation function that can be executed on the handheld electronic device of FIG. 1;

FIG. 4 is another exemplary flowchart depicting certain aspects of a learning method that can be executed on the handheld electronic device;

FIG. 5 is an exemplary output during a text entry operation;

FIG. 6 is another exemplary output during another part of the text entry operation;

FIG. 7 is another exemplary output during another part of the text entry operation;

FIG. 8 is another exemplary output during another part of the text entry operation;

FIG. 9 is an exemplary flowchart depicting the use of context data during a text entry operation;

FIG. 10 is a top plan view of an improved handheld electronic device in accordance with another embodiment of the disclosed and claimed concept;

FIG. 11 depicts an exemplary menu that can be output on the handheld electronic device of FIG. 10;

FIG. 12 depicts another exemplary menu;

FIG. 13 depicts an exemplary reduced menu;

FIG. 14 is an exemplary output such as could occur during a text entry or text editing operation;

FIG. 15 is an exemplary output during a text entry operation;

FIG. 16 is an alternative exemplary output during a text entry operation;

FIG. 17 is another exemplary output during a part of text entry operation;

FIG. 18 is an exemplary output during a data entry operation;

FIG. 19 is a top plan view of an improved handheld electronic device in accordance with still another embodiment of the disclosed and claimed concept; and

FIG. 20 is a schematic depiction of the improved handheld electronic device of FIG. 19.

Similar numerals refer to similar parts throughout the specification.

DESCRIPTION

An improved handheld electronic device 4 is indicated generally in FIG. 1 and is depicted schematically in FIG. 2. The exemplary handheld electronic device 4 includes a housing 6 upon which are disposed a processor unit that includes an input apparatus 8, an output apparatus 12, a processor 16, a memory 20, and at least a first routine. The processor 16 may be, for instance, and without limitation, a microprocessor (μP) and is responsive to inputs from the input apparatus 8 and provides output signals to the output apparatus 12. The processor 16 also interfaces with the memory 20. The processor 16 and the memory 20 together form a processor apparatus. Examples of handheld electronic devices are included in U.S. Pat. Nos. 6,452,588 and 6,489,950, which are incorporated by reference herein.

As can be understood from FIG. 1, the input apparatus 8 includes a keypad 24 and a thumbwheel 32. As will be described in greater detail below, the keypad 24 is in the exemplary form of a reduced QWERTY keyboard including a plurality of keys 28 that serve as input members. It is noted, however, that the keypad 24 may be of other configurations, such as an AZERTY keyboard, a QWERTZ keyboard, or other keyboard arrangement, whether presently known or unknown, and either reduced or not reduced. As employed herein, the expression “reduced” and variations thereof in the context of a keyboard, a keypad, or other arrangement of input members, shall refer broadly to an arrangement in which at least one of the input members has assigned thereto a plurality of linguistic elements such as, for example, characters in the set of Latin letters, whereby an actuation of the at least one of the input members, without another input in combination therewith, is an ambiguous input since it could refer to more than one of the plurality of linguistic elements assigned thereto. As employed herein, the expression “linguistic element” and variations thereof shall refer broadly to any element that itself can be a language object or from which a language object can be constructed, identified, or otherwise obtained, and thus would include, for example and without limitation, characters, letters, strokes, ideograms, phonemes, morphemes, digits, and the like. As employed herein, the expression “language object” and variations thereof shall refer broadly to any type of object that may be constructed, identified, or otherwise obtained from one or more linguistic elements, that can be used alone or in combination to generate text, and that would include, for example and without limitation, words, shortcuts, symbols, ideograms, and the like.

The system architecture of the handheld electronic device 4 advantageously is organized to be operable independent of the specific layout of the keypad 24. Accordingly, the system architecture of the handheld electronic device 4 can be employed in conjunction with virtually any keypad layout substantially without requiring any meaningful change in the system architecture. It is further noted that certain of the features set forth herein are usable on either or both of a reduced keyboard and a non-reduced keyboard.

The keys 28 are disposed on a front face of the housing 6, and the thumbwheel 32 is disposed at a side of the housing 6. The thumbwheel 32 can serve as another input member and is both rotatable, as is indicated by the arrow 34, to provide selection inputs to the processor 16, and also can be pressed in a direction generally toward the housing 6, as is indicated by the arrow 38, to provide another selection input to the processor 16.

As can further be seen in FIG. 1, many of the keys 28 include a number of linguistic elements 48 disposed thereon. As employed herein, the expression “a number of” and variations thereof shall refer broadly to any quantity, including a quantity of one. In the exemplary depiction of the keypad 24, many of the keys 28 include two linguistic elements, such as including a first linguistic element 52 and a second linguistic element 56 assigned thereto.

One of the keys 28 of the keypad 24 includes as the characters 48 thereof the letters “Q” and “W”, and an adjacent key 28 includes as the characters 48 thereof the letters “E” and “R”. It can be seen that the arrangement of the characters 48 on the keys 28 of the keypad 24 is generally of a QWERTY arrangement, albeit with many of the keys 28 including two of the characters 48.

The output apparatus 12 includes a display 60 upon which can be provided an output 64. An exemplary output 64 is depicted on the display 60 in FIG. 1. The output 64 includes a text component 68 and a variant component 72. The variant component 72 includes a default portion 76 and a variant portion 80. The display also includes a caret 84 that depicts generally where the next input from the input apparatus 8 will be received.

The text component 68 of the output 64 provides a depiction of the default portion 76 of the output 64 at a location on the display 60 where the text is being input. The variant component 72 is disposed generally in the vicinity of the text component 68 and provides, in addition to the default proposed output 76, a depiction of the various alternate text choices, i.e., alternates to the default proposed output 76, that are proposed by an input disambiguation function in response to an input sequence of key actuations of the keys 28.

As will be described in greater detail below, the default portion 76 is proposed by the disambiguation function as being the most likely disambiguated interpretation of the ambiguous input provided by the user. The variant portion 80 includes a predetermined quantity of alternate proposed interpretations of the same ambiguous input from which the user can select, if desired. It is noted that the exemplary variant portion 80 is depicted herein as extending vertically below the default portion 76, but it is understood that numerous other arrangements could be provided.

The memory 20 is depicted schematically in FIG. 2A. The memory 20 can be any of a variety of types of internal and/or external storage media such as, without limitation, RAM, ROM, EPROM(s), EEPROM(s), and the like that provide a storage register for data storage such as in the fashion of an internal storage area of a computer, and can be volatile memory or nonvolatile memory. The memory 20 additionally includes a number of routines depicted generally with the numeral 22 for the processing of data. The routines 22 can be in any of a variety of forms such as, without limitation, software, firmware, and the like. As will be explained in greater detail below, the routines 22 include the aforementioned disambiguation function as an application, as well as other routines.

As can be understood from FIG. 2A, the memory 20 additionally includes data stored and/or organized in a number of tables, sets, lists, and/or otherwise. Specifically, the memory 20 includes a generic word list 88, a new words database 92, another data source 99 and a contextual data table 49.

Stored within the various areas of the memory 20 are a number of language objects 100 and frequency objects 104. The language objects 100 generally are each associated with an associated frequency object 104. The language objects 100 include, in the present exemplary embodiment, a plurality of word objects 108 and a plurality of N-gram objects 112. The word objects 108 are generally representative of complete words within the language or custom words stored in the memory 20. For instance, if the language stored in the memory 20 is, for example, English, generally each word object 108 would represent a word in the English language or would represent a custom word.

Associated with substantially each word object 108 is a frequency object 104 having frequency value that is indicative of the relative frequency within the relevant language of the given word represented by the word object 108. In this regard, the generic word list 88 includes a plurality of word objects 108 and associated frequency objects 104 that together are representative of a wide variety of words and their relative frequency within a given vernacular of, for instance, a given language. The generic word list 88 can be derived in any of a wide variety of fashions, such as by analyzing numerous texts and other language sources to determine the various words within the language sources as well as their relative probabilities, i.e., relative frequencies, of occurrences of the various words within the language sources.

The N-gram objects 112 stored within the generic word list 88 are short strings of characters within the relevant language typically, for example, one to three characters in length, and typically represent word fragments within the relevant language, although certain of the N-gram objects 112 additionally can themselves be words. However, to the extent that an N-gram object 112 also is a word within the relevant language, the same word likely would be separately stored as a word object 108 within the generic word list 88. As employed herein, the expression “string” and variations thereof shall refer broadly to an object having one or more characters or components, and can refer to any of a complete word, a fragment of a word, a custom word or expression, and the like.

In the present exemplary embodiment of the handheld electronic device 4, the N-gram objects 112 include 1-gram objects, i.e., string objects that are one character in length, 2-gram objects, i.e., string objects that are two characters in length, and 3-gram objects, i.e., string objects that are three characters in length, all of which are collectively referred to as N-grams 112. Substantially each N-gram object 112 in the generic word list 88 is similarly associated with an associated frequency object 104 stored within the generic word list 88, but the frequency object 104 associated with a given N-gram object 112 has a frequency value that indicates the relative probability that the character string represented by the particular N-gram object 112 exists at any location within any word of the relevant language. The N-gram objects 112 and the associated frequency objects 104 are a part of the corpus of the generic word list 88 and are obtained in a fashion similar to the way in which the word object 108 and the associated frequency objects 104 are obtained, although the analysis performed in obtaining the N-gram objects 112 will be slightly different because it will involve analysis of the various character strings within the various words instead of relying primarily on the relative occurrence of a given word.

The present exemplary embodiment of the handheld electronic device 4, with its exemplary language being the English language, includes twenty-six 1-gram N-gram objects 112, i.e., one 1-gram object for each of the twenty-six letters in the Latin alphabet upon which the English language is based, and further includes 676 2-gram N-gram objects 112, i.e., twenty-six squared, representing each two-letter permutation of the twenty-six letters within the Latin alphabet.

The N-gram objects 112 also include a certain quantity of 3-gram N-gram objects 112, primarily those that have a relatively high frequency within the relevant language. The exemplary embodiment of the handheld electronic device 4 includes fewer than all of the three-letter permutations of the twenty-six letters of the Latin alphabet due to considerations of data storage size, and also because the 2-gram N-gram objects 112 can already provide a meaningful amount of information regarding the relevant language. As will be set forth in greater detail below, the N-gram objects 112 and their associated frequency objects 104 provide frequency data that can be attributed to character strings for which a corresponding word object 108 cannot be identified or has not been identified, and typically is employed as a fallback data source, although this need not be exclusively the case.

In the present exemplary embodiment, the language objects 100 and the frequency objects 104 are maintained substantially inviolate in the generic word list 88, meaning that the basic language dictionary remains substantially unaltered within the generic word list 88, and the learning functions that are provided by the handheld electronic device 4 and that are described below operate in conjunction with other object that are generally stored elsewhere in memory 20, such as, for example, in the new words database 92.

The new words database 92 stores additional word objects 108 and associated frequency objects 104 in order to provide to a user a customized experience in which words and the like that are used relatively more frequently by a user will be associated with relatively higher frequency values than might otherwise be reflected in the generic word list 88. More particularly, the new words database 92 includes word objects 108 that are user-defined and that generally are not found among the word objects 108 of the generic word list 88. Each word object 108 in the new words database 92 has associated therewith an associated frequency object 104 that is also stored in the new words database 92.

FIGS. 3A, 3B, and 3C depict in an exemplary fashion the general operation of certain aspects of the disambiguation function of the handheld electronic device 4. Additional features, functions, and the like are depicted and described elsewhere.

An input is detected, as at 204, and the input can be any type of actuation or other operation as to any portion of the input apparatus 8. A typical input would include, for instance, an actuation of a key 28 having a number of characters 48 thereon, or any other type of actuation or manipulation of the input apparatus 8.

The disambiguation function then determines, as at 212, whether the current input is an operational input, such as a selection input, a delimiter input, a movement input, an alternation input, or, for instance, any other input that does not constitute an actuation of a key 28 having a number of characters 48 thereon. If the input is determined at 212 to not be an operational input, processing continues at 216 by adding the input to the current input sequence which may or may not already include an input.

Many of the inputs detected at 204 are employed in generating input sequences as to which the disambiguation function will be executed. An input sequence is build up in each “session” with each actuation of a key 28 having a number of characters 48 thereon. Since an input sequence typically will be made up of at least one actuation of a key 28 having a plurality of characters 48 thereon, the input sequence will be ambiguous. When a word, for example, is completed the current session is ended and a new session is initiated.

An input sequence is gradually built up on the handheld electronic device 4 with each successive actuation of a key 28 during any given session. Specifically, once a delimiter input is detected during any given session, the session is terminated and a new session is initiated. Each input resulting from an actuation of one of the keys 28 having a number of the characters 48 associated therewith is sequentially added to the current input sequence. As the input sequence grows during a given session, the disambiguation function generally is executed with each actuation of a key 28, i.e., input, and as to the entire input sequence. Stated otherwise, within a given session, the growing input sequence is attempted to be disambiguated as a unit by the disambiguation function with each successive actuation of the various keys 28.

Once a current input representing a most recent actuation of the one of the keys 28 having a number of the characters 48 assigned thereto has been added to the current input sequence within the current session, as at 216 in FIG. 3A, the disambiguation function generates, as at 220, substantially all of the permutations of the characters 48 assigned to the various keys 28 that were actuated in generating the input sequence. In this regard, the “permutations” refer to the various strings that can result from the characters 48 of each actuated key 28 limited by the order in which the keys 28 were actuated. The various permutations of the characters in the input sequence are employed as prefix objects.

For instance, if the current input sequence within the current session is the ambiguous input of the keys “AS” and “OP”, the various permutations of the first character 52 and the second character 56 of each of the two keys 28, when considered in the sequence in which the keys 28 were actuated, would be “SO”, “SP”, “AP”, and “AO”, and each of these is a prefix object that is generated, as at 220, with respect to the current input sequence. As will be explained in greater detail below, the disambiguation function seeks to identify for each prefix object one of the word objects 108 for which the prefix object would be a prefix.

For each generated prefix object, the memory 20 is consulted, as at 224, to identify, if possible, for each prefix object one of the word objects 108 in the memory 20 that corresponds with the prefix object, meaning that the sequence of letters represented by the prefix object would be either a prefix of the identified word object 108 or would be substantially identical to the entirety of the word object 108. Further in this regard, the word object 108 that is sought to be identified is the highest frequency word object 108. That is, the disambiguation function seeks to identify the word object 108 that corresponds with the prefix object and that also is associated with a frequency object 104 having a relatively higher frequency value than any of the other frequency objects 104 associated with the other word objects 108 that correspond with the prefix object.

It is noted in this regard that the word objects 108 in the generic word list 88 are generally organized in data tables that correspond with the first two letters of various words. For instance, the data table associated with the prefix “CO” would include all of the words such as “CODE”, “COIN”, “COMMUNICATION”, and the like. Depending upon the quantity of word objects 108 within any given data table, the data table may additionally include sub-data tables within which word objects 108 are organized by prefixes that are three characters or more in length. Continuing onward with the foregoing example, if the “CO” data table included, for instance, more than 256 word objects 108, the “CO” data table would additionally include one or more sub-data tables of word objects 108 corresponding with the most frequently appearing three-letter prefixes. By way of example, therefore, the “CO” data table may also include a “COM” sub-data table and a “CON” sub-data table. If a sub-data table includes more than the predetermined number of word objects 108, for example a quantity of 256, the sub-data table may include further sub-data tables, such as might be organized according to a four letter prefixes. It is noted that the aforementioned quantity of 256 of the word objects 108 corresponds with the greatest numerical value that can be stored within one byte of the memory 20.

Accordingly, when, at 224, each prefix object is sought to be used to identify a corresponding word object 108, and for instance the instant prefix object is “AP”, the “AP” data table will be consulted. Since all of the word objects 108 in the “AP” data table will correspond with the prefix object “AP”, the word object 108 in the “AP” data table with which is associated a frequency object 104 having a frequency value relatively higher than any of the other frequency objects 104 in the “AP” data table is identified. The identified word object 108 and the associated frequency object 104 are then stored in a result register that serves as a result of the various comparisons of the generated prefix objects with the contents of the memory 20.

It is noted that one or more, or possibly all, of the prefix objects will be prefix objects for which a corresponding word object 108 is not identified in the memory 20. Such prefix objects are considered to be orphan prefix objects and are separately stored or are otherwise retained for possible future use. In this regard, it is noted that many or all of the prefix objects can become orphan object if, for instance, the user is trying to enter a new word or, for example, if the user has mis-keyed and no word corresponds with the mis-keyed input.

Processing continues, as at 232, where duplicate word objects 108 associated with relatively lower frequency values are deleted from the result. Such a duplicate word object 108 could be generated, for instance, by the other data source 99.

Once the duplicate word objects 108 and the associated frequency objects 104 have been removed at 232, processing branches, as at 234, to a subsystem in FIG. 9, described below, wherein the need to examine context data is evaluated. Once context data is evaluated, as in FIG. 9, processing returns to 236, as in FIG. 3C, wherein the remaining prefix objects are arranged in an output set in decreasing order of frequency value.

If it is determined, as at 240, that the flag has been set, meaning that a user has made a selection input, either through an express selection input or through an alternation input of a movement input, then the default output 76 is considered to be “locked,” meaning that the selected variant will be the default prefix until the end of the session. If it is determined at 240 that the flag has been set, the processing will proceed to 244 where the contents of the output set will be altered, if needed, to provide as the default output 76 an output that includes the selected prefix object, whether it corresponds with a word object 108 or is an artificial variant. In this regard, it is understood that the flag can be set additional times during a session, in which case the selected prefix associated with resetting of the flag thereafter becomes the “locked” default output 76 until the end of the session or until another selection input is detected.

Processing then continues, as at 248, to an output step after which an output 64 is generated as described above. Processing thereafter continues at 204 where additional input is detected. On the other hand, if it is determined at 240 that the flag had not been set, then processing goes directly to 248 without the alteration of the contents of the output set at 244.

If the detected input is determined, as at 212, to be an operational input, processing then continues to determine the specific nature of the operational input. For instance, if it is determined, as at 252, that the current input is a selection input, processing continues at 254 where the flag is set. Processing then returns to detection of additional inputs as at 204.

If it is determined, as at 260, that the input is a delimiter input, processing continues at 264 where the current session is terminated and processing is transferred, as at 266, to the learning function subsystem, as at 404 of FIG. 4. A delimiter input would include, for example, the actuation of a <SPACE> key 116, which would both enter a delimiter symbol and would add a space at the end of the word, actuation of the <ENTER> key, which might similarly enter a delimiter input and enter a space, and by a translation of the thumbwheel 32, such as is indicated by the arrow 38, which might enter a delimiter input without additionally entering a space.

It is first determined, as at 408, whether the default output at the time of the detection of the delimiter input at 260 matches a word object 108 in the memory 20. If it does not, this means that the default output is a user-created output that should be added to the new words database 92 for future use. In such a circumstance processing then proceeds to 412 where the default output is stored in the new words database 92 as a new word object 108. Additionally, a frequency object 104 is stored in the new words database 92 and is associated with the aforementioned new word object 108. The new frequency object 104 is given a relatively high frequency value, typically within the upper one-fourth or one-third of a predetermined range of possible frequency values.

In this regard, frequency objects 104 are given an absolute frequency value generally in the range of zero to 65,535. The maximum value represents the largest number that can be stored within two bytes of the memory 20. The new frequency object 104 that is stored in the new words database 92 is assigned an absolute frequency value within the upper one-fourth or one-third of this range, particularly since the new word was used by a user and is likely to be used again.

With further regard to frequency object 104, it is noted that within a given data table, such as the “CO” data table mentioned above, the absolute frequency value is stored only for the frequency object 104 having the highest frequency value within the data table. All of the other frequency objects 104 in the same data table have frequency values stored as percentage values normalized to the aforementioned maximum absolute frequency value. That is, after identification of the frequency object 104 having the highest frequency value within a given data table, all of the other frequency objects 104 in the same data table are assigned a percentage of the absolute maximum value, which represents the ratio of the relatively smaller absolute frequency value of a particular frequency object 104 to the absolute frequency value of the aforementioned highest value frequency object 104. Advantageously, such percentage values can be stored within a single byte of memory, thus saving storage space within the handheld electronic device 4.

Upon creation of the new word object 108 and the new frequency object 104, and storage thereof within the new words database 92, processing is transferred to 420 where the learning process is terminated. Processing is then returned to the main process, as at 204. If at 408 it is determined that the word object 108 in the default output 76 matches a word object 108 within the memory 20, processing is returned directly to the main process at 204.

With further regard to the identification of various word objects 108 for correspondence with generated prefix objects, it is noted that the memory 20 can include a number of additional data sources 99 in addition to the generic word list 88 and the new words database 92, all of which can be considered linguistic sources. It is understood that the memory 20 might include any number of other data sources 99. The other data sources 99 might include, for example, an address database, a speed-text database, or any other data source without limitation. An exemplary speed-text database might include, for example, sets of words or expressions or other data that are each associated with, for example, a character string that may be abbreviated. For example, a speed-text database might associate the string “br” with the set of words “Best Regards”, with the intention that a user can type the string “br” and receive the output “Best Regards”.

In seeking to identify word objects 108 that correspond with a given prefix object, the handheld electronic device 4 may poll all of the data sources in the memory 20. For instance the handheld electronic device 4 may poll the generic word list 88, the new words database 92, and the other data sources 99 to identify word objects 108 that correspond with the prefix object. The contents of the other data sources 99 may be treated as word objects 108, and the processor 16 may generate frequency objects 104 that will be associated with such word objects 108 and to which may be assigned a frequency value in, for example, the upper one-third or one-fourth of the aforementioned frequency range. Assuming that the assigned frequency value is sufficiently high, the string “br”, for example, would typically be output to the display 60. If a delimiter input is detected with respect to the portion of the output having the association with the word object 108 in the speed-text database, for instance “br”, the user would receive the output “Best Regards”, it being understood that the user might also have entered a selection input as to the exemplary string “br”.

The contents of any of the other data sources 99 may be treated as word objects 108 and may be associated with generated frequency objects 104 having the assigned frequency value in the aforementioned upper portion of the frequency range. After such word objects 108 are identified, the new word learning function can, if appropriate, act upon such word objects 108 in the fashion set forth above.

If it is determined, such as at 268, that the current input is a movement input, such as would be employed when a user is seeking to edit an object, either a completed word or a prefix object within the current session, the caret 84 is moved, as at 272, to the desired location, and the flag is set, as at 276. Processing then returns to where additional inputs can be detected, as at 204.

In this regard, it is understood that various types of movement inputs can be detected from the input device 8. For instance, a rotation of the thumbwheel 32, such as is indicated by the arrow 34 of FIG. 1, could provide a movement input. In the instance where such a movement input is detected, such as in the circumstance of an editing input, the movement input is additionally detected as a selection input. Accordingly, and as is the case with a selection input such as is detected at 252, the selected variant is effectively locked with respect to the default portion 76 of the output 64. Any default output 76 during the same session will necessarily include the previously selected variant.

In the present exemplary embodiment of the handheld electronic device 4, if it is determined, as at 252, that the input is not a selection input, and it is determined, as at 260, that the input is not a delimiter input, and it is further determined, as at 268, that the input is not a movement input, in the current exemplary embodiment of the handheld electronic device 4 the only remaining operational input generally is a detection of the <DELETE> key 86 of the keys 28 of the keypad 24. Upon detection of the <DELETE> key 86, the final character of the default output is deleted, as at 280. Processing thereafter returns to 204 where additional input can be detected.

An exemplary input sequence is depicted in FIGS. 1 and 5-8. In this example, the user is attempting to enter the word “APPLOADER”, and this word presently is not stored in the memory 20. In FIG. 1 the user has already typed the “AS” key 28. Since the data tables in the memory 20 are organized according to two-letter prefixes, the contents of the output 64 upon the first keystroke are obtained from the N-gram objects 112 within the memory. The first keystroke “AS” corresponds with a first N-gram object 112 “S” and an associated frequency object 104, as well as another N-gram object 112 “A” and an associated frequency object 104. While the frequency object 104 associated with “S” has a frequency value greater than that of the frequency object 104 associated with “A”, it is noted that “A” is itself a complete word. A complete word is always provided as the default output 76 in favor of other prefix objects that do not match complete words, regardless of associated frequency value. As such, in FIG. 1, the default portion 76 of the output 64 is “A”.

In FIG. 5, the user has additionally entered the “OP” key 28. The variants are depicted in FIG. 5. Since the prefix object “SO” is also a word, it is provided as the default output 76. In FIG. 6, the user has again entered the “OP” key 28 and has also entered the “L” key 28. It is noted that the exemplary “L” key 28 depicted herein includes only the single character 48 “L”.

It is assumed in the instant example that no operational inputs have thus far been detected. The default output 76 is “APPL”, such as would correspond with the word “APPLE”. The prefix “APPL” is depicted both in the text component 68, as well as in the default portion 76 of the variant component 72. Variant prefix objects in the variant portion 80 include “APOL”, such as would correspond with the word “APOLOGIZE”, and the prefix “SPOL”, such as would correspond with the word “SPOLIATION”.

It is particularly noted that the additional variants “AOOL”, “AOPL”, “SOPL”, and “SOOL” are also depicted as variants 80 in the variant component 72. Since no word object 108 corresponds with these prefix objects, the prefix objects are considered to be orphan prefix objects for which a corresponding word object 108 was not identified. In this regard, it may be desirable for the variant component 72 to include a specific quantity of entries, and in the case of the instant exemplary embodiment the quantity is seven entries. Upon obtaining the result at 224, if the quantity of prefix objects in the result is fewer than the predetermined quantity, the disambiguation function will seek to provide additional outputs until the predetermined number of outputs are provided.

In FIG. 7 the user has additionally entered the “OP” key 28. In this circumstance, and as can be seen in FIG. 7, the default portion 76 of the output 64 has become the prefix object “APOLO” such as would correspond with the word “APOLOGIZE”, whereas immediately prior to the current input the default portion 76 of the output 64 of FIG. 6 was “APPL” such as would correspond with the word “APPLE.” Again, assuming that no operational inputs had been detected, the default prefix object in FIG. 7 does not correspond with the previous default prefix object of FIG. 6. As such, a first artificial variant “APOLP” is generated and in the current example is given a preferred position. The aforementioned artificial variant “APOLP” is generated by deleting the final character of the default prefix object “APOLO” and by supplying in its place an opposite character 48 of the key 28 which generated the final character of the default portion 76 of the output 64, which in the current example of FIG. 7 is “P”, so that the aforementioned artificial variant is “APOLP”.

Furthermore, since the previous default output “APPL” corresponded with a word object 108, such as the word object 108 corresponding with the word “APPLE”, and since with the addition of the current input the previous default output “APPL” no longer corresponds with a word object 108, two additional artificial variants are generated. One artificial variant is “APPLP” and the other artificial variant is “APPLO”, and these correspond with the previous default output “APPL” plus the characters 48 of the key 28 that was actuated to generate the current input. These artificial variants are similarly output as part of the variant portion 80 of the output 64.

As can be seen in FIG. 7, the default portion 76 of the output 64 “APOLO” no longer seems to match what would be needed as a prefix for “APPLOADER”, and the user likely anticipates that the desired word “APPLOADER” is not already stored in the memory 20. As such, the user provides a selection input, such as by scrolling with the thumbwheel 32 until the variant string “APPLO” is highlighted. The user then continues typing and enters the “AS” key.

The output 64 of such action is depicted in FIG. 8. Here, the string “APPLOA” is the default portion 76 of the output 64. Since the variant string “APPLO” became the default portion 76 of the output 64 (not expressly depicted herein) as a result of the selection input as to the variant string “APPLO”, and since the variant string “APPLO” does not correspond with a word object 108, the character strings “APPLOA” and “APPLOS” were created as an artificial variants. Additionally, since the previous default of FIG. 7, “APOLO” previously had corresponded with a word object 108, but now is no longer in correspondence with the default portion 76 of the output 64 of FIG. 8, the additional artificial variants of “APOLOA” and “APOLOS” were also generated. Such artificial variants are given a preferred position in favor of the three displayed orphan prefix objects.

Since the current input sequence in the example no longer corresponds with any word object 108, the portions of the method related to attempting to find corresponding word objects 108 are not executed with further inputs for the current session. That is, since no word object 108 corresponds with the current input sequence, further inputs will likewise not correspond with any word object 108. Avoiding the search of the memory 20 for such nonexistent word objects 108 saves time and avoids wasted processing effort.

As the user continues to type, the user ultimately will successfully enter the word “APPLOADER” and will enter a delimiter input. Upon detection of the delimiter input after the entry of “APPLOADER”, the learning function is initiated. Since the word “APPLOADER” does not correspond with a word object 108 in the memory 20, a new word object 108 corresponding with “APPLOADER” is generated and is stored in the new words database 92, along with a corresponding new frequency object 104 which is given an absolute frequency in the upper, say, one-third or one-fourth of the possible frequency range. In this regard, it is noted that the new words database 92 is generally organized in two-character prefix data tables similar to those found in the generic word list 88. As such, the new frequency object 104 is initially assigned an absolute frequency value, but upon storage the absolute frequency value, if it is not the maximum value within that data table, will be changed to include a normalized frequency value percentage normalized to whatever is the maximum frequency value within that data table.

It is noted that the layout of the characters 48 disposed on the keys 28 in FIG. 1 is an exemplary character layout that would be employed where the intended primary language used on the handheld electronic device 4 was, for instance, English. Other layouts involving these characters 48 and/or other characters can be used depending upon the intended primary language and any language bias in the makeup of the language objects 100.

As mentioned elsewhere herein, a complete word that is identified during a disambiguation cycle is always provided as a default output 76 in favor of other prefix objects that do not match complete words, regardless of associated frequency value. That is, a word object 108 corresponding with an ambiguous input and having a length equal to that of the ambiguous input is output at a position of priority over other prefix objects. As employed herein, the expression “length” and variations thereof shall refer broadly to a quantity of elements of which an object is comprised, such as the quantity of linguistic elements of which a language object 100 is comprised.

If more than one complete word is identified during a disambiguation cycle, all of the complete words may be output in order of decreasing frequency with respect to one another, with each being at a position of priority over the prefix objects that are representative of incomplete words. However, it may be desirable in certain circumstances to employ additional data, if available, to prioritize the complete words in a way more advantageous to the user.

The handheld electronic device 4 thus advantageously includes the contextual data table 49 stored in the memory 20. The exemplary contextual data table 49 can be said to have stored therein a number of ambiguous words and associated context data.

Specifically, the contextual data table 49 comprises a number of key objects 47 and, associated with each key object 47, a number of associated contextual value objects 51. In the present exemplary embodiment in which the English language is employed on the handheld electronic device 4, each key object 47 is a word object 108. That is, a key object 47 in the contextual data table 49 is also stored as a word object 108 in one of the generic word list 88, the new words database 92, and the other data sources 99. Each key object 47 has associated therewith one or more contextual value objects 51 that are each representative of a particular contextual data element. If a key object 47 is identified during a cycle of disambiguation with respect to an ambiguous input, and if a contextual value object 51 associated with the key object 47 coincides with a context of the ambiguous input, the word object 108 corresponding with the key object 47 is output as a default word output at the text component 68 and at the default portion 76 of the variant component 72 In other embodiments, however, it is understood that the key objects 47 could be in forms other than in the form of word objects 108.

The contents of the contextual data table 49 are obtained by analyzing the language objects 100 and the data corpus from which the language objects 100 and frequency objects 104 were obtained. First, the language objects 100 are analyzed to identify ambiguous word objects 108. A set of ambiguous word objects 108 are representative of a plurality of complete words which are each formed from the same ambiguous input such as, for example, the words “TOP” and “TOO”, which are each formed from the ambiguous input <TY><OP><OP>. Each ambiguous word object 108 has associated therewith a frequency object 104. In a given set of ambiguous word objects 108, each ambiguous word object 108 with which is associated a frequency object 104 having a frequency value less than the highest in the set is a candidate key object 47. That is, in a given set of ambiguous word objects 108, all of the ambiguous word objects 108 are candidate key objects 47, except for the ambiguous word object 108 having associated therewith the frequency object 104 having the relatively highest frequency value in the set. This is because, as will be explained in greater detail elsewhere herein, the anticipated situation in which context data is relevant during a text entry is wherein a plurality of ambiguous word objects 108 are identified in a disambiguation cycle, and a lower-frequency ambiguous word object 108 is desirably output at a relatively preferred position because it would be a more appropriate solution in a particular context.

Once the candidate key objects 47 are identified, the data corpus is analyzed to identify any valid contextual data for the candidate key objects 47. Valid contextual data is any particular context wherein occurs any statistically significant incidence of a particular key object 47.

One exemplary context is that in which a particular ambiguous word follows, to a statistically significant extent, a particular word. For instance, and continuing the example above, it may be determined that the key word “TOP” occurs, to a statistically significant extent, after the context word “TABLE” and after the context word “HILL”. Depending upon the configuration of the contextual data table 49, such a context might be limited to a particular word that immediately precedes a particular ambiguous word, or it might include a particular word that precedes a particular ambiguous word by one, two, three, or more words. That is, the ambiguous key word “TOP” might occur to a statistically significant extent when it immediately follows the context word “TABLE”, but the same ambiguous key word “TOP” might occur to a statistically significant extent when it follows the context word “HILL” immediately or by two, three, or four words. In such a circumstance, the ambiguous word object 108 “TOP” would be stored as a key object 47, and the word objects 108 “TABLE” and “HILL” would be stored as two associated contextual value objects 51.

Another exemplary context is that in which a particular ambiguous word is, to a statistically significant extent, a first word in a sentence. In such a situation, the identified context might be that in which the particular ambiguous word follows, to a statistically significant extent, one or more particular punctuation marks such as the period “.”, the question mark “?”, and the exclamation point “!”. In such a situation, the contextual value object 51 would be the particular punctuation symbol, with each such statistically significant punctuation symbol being a separate contextual value object 51.

Still another exemplary context is that in which a particular ambiguous word follows, to a statistically significant extent, another entry that is in a predetermined format. In such a situation, the identified context might, for example, be that in which the particular ambiguous word follows, to a statistically significant extent, an entry that has a predetermined arrangement of numeric components. For instance, a numerically indicated date might be indicated in any of the following formats: NN/NN/NNNN or NN/NN/NN or N/NN/NNNN or N/NN/NN or N/N/NNNN or N/N/NN or other formats, wherein “N” refers to an Arabic digit, and “/” might refer to any of a particular symbol, a delimiter, or a “null” such as a <SPACE> or nothing. As such, it might be determined that a particular ambiguous word follows, to a statistically significant extent, another entry that is in any of one or more of the formats NN/NN/NNNN or NN/NN/NN or N/NN/NNNN or N/NN/NN or N/N/NNNN or N/N/NN. Again, the particular ambiguous word might immediately follow the formatted entry or might follow two, three, or more words behind the formatted entry. In such a situation, the contextual value object 51 would be a representation of the particular format, with each such statistically significant format being a separate contextual value object 51.

More specifically, the contextual value objects 51 can each be stored as a hash, i.e., an integer value that results from a mathematical manipulation. For instance, the two contextual value objects 51 “TABLE” and “HILL”, while being word objects 108, would be stored in the contextual data table 49 as hashes of the words “TABLE” and “HILL”. The key objects 47, such as the word “TOP” can similarly each be stored as a hash.

The three contextual value objects 51 “.”, “?”, and “!” would each be stored as a hash, i.e., an integer value, that would be more in the nature of a flag, i.e., an integer value representative of a punctuation symbol itself or being of a value that is different than the hash of any of the twenty-six Latin letters. The contextual value objects 51 in the nature of predetermined formats could be similarly stored.

During text entry, the disambiguation system maintains in a temporary memory register a hash of a number of the entries preceding the current ambiguous input. For instance, if the user is attempting to enter the phrase, “CLIMB THE HILL AND REACH THE TOP”, the disambiguation routine 22 would have calculated and stored a hash of each of one or more of the words “CLIMB”, “THE”, “HILL”, “AND”, “REACH”, and “THE” as entry values 53 prior to the user entering the series of keystrokes <TY><OP><OP>, which would result in the ambiguous words “TOO” and “TOP”. The memory 20 may be configured to store only a predetermined quantity of such entry values 53, which would be replaced on a first-in-first-out basis as additional words are entered. For instance, if the memory only stored the last four entries as entry values 53, the four entry values in existence at the time the user was entering the keystrokes for the word “TOP” would be hashes of the words “HILL”, “AND”, “REACH”, and “THE”. In other systems, for example, the disambiguation routine might store as an entry value only the one entry immediately preceding the current input.

Once the user enters the series of keystrokes <TY><OP><OP>, the disambiguation routine would determine that the two word objects 108 “TOO” and “TOP” each correspond with and have a length equal to that of the series of keystrokes <TY><OP><OP>, and thus would determine that the two word objects 108 “TOO” and “TOP” represent ambiguous words. If it is assumed that the ambiguous word object 108 “TOO” has associated therewith a frequency object 104 having a frequency value higher than that of the frequency object 104 associated with the ambiguous word object 108 “TOP”, the disambiguation routine 22 will consult the contextual data table 49 to determine whether the text already input provides a context wherein it would be appropriate to output the word object 108 “TOP” at a position of higher priority than the higher frequency word object 108 “TOO”.

Specifically, the disambiguation routine 22 would look to see if the contextual data table 49 has stored therein a key object 47 matching the word object 108 “TOP”. If such a key object 47 is found, the various contextual value objects 51 associated with the key object 47 “TOP” are compared with each of the entry values 53 which, in the present example, would be hashes of the words “HILL”, “AND”, “REACH”, and “THE” to determine whether or not any of the contextual value objects 51 coincide with any of the entry values 53. As employed herein, the expression “coincide” and variations thereof shall refer broadly to any type of predetermined equivalence, correspondence, association, and the like, the existence of which can be ascertained between two or more objects. Since one of the contextual value objects 51 associated with the key object 47 “TOP” is a hash of the word object 108 “HILL”, and since one of the entry values 53 is a hash of the previously entered word “HILL”, upon comparison the two hashes will be found to coincide on the basis of being equal. As a result, the key object 47, i.e., the ambiguous word object 108, “TOP” will be output at a position of priority with respect to the ambiguous word object 108 “TOO” despite the ambiguous word object 108 “TOO” being of a relatively higher frequency.

The disambiguation routine 22 would also store as entry values 53 hashes representative of punctuation symbols and non-word entries for use in comparison with contextual value objects 51 in the same fashion. This is useful when searching for contexts wherein the contextual value objects 51 are representative of punctuation marks, predetermined formats, and the like. For instance, if the predetermined format is a date format such as suggested above, an associated key object 47 will be output at a preferred position if it is preceded by an entry in the form of a date. It is understood that numerous other types of predefined formats could be employed, such as other date format like “Month date, year” or “date Month year”, time formats, and any other type of predetermined format if determined to be a statistically significant context. It is also understood that numerous other types of contexts could be identified, stored, and employed with the disambiguation routine 22 without departing from the present concept.

The present system is particularly advantageous due to its flexibility. It does not require the establishment of blanket “rules” for prioritization of words in contexts. Rather, each lesser-frequency ambiguous word has associated therewith statistically significant context data, which enables the handheld electronic device 4 to be adaptable and customizable to the needs of the user.

Briefly summarized, therefore, and depicted generally in FIG. 9 as branching from the main process at 234 in FIG. 3A, the disambiguation routine 22 determines, as at 604, whether or not at least two of the word objects 108 identified at 224 in FIG. 3A and stored in the result each have a length equal to that of the ambiguous input, and thus are ambiguous word objects 108. If not, processing returns, as at 608, to the main process at 236 in FIG. 3C. If it is determined at 604 that the result includes at least two ambiguous word objects 108, processing continues to 612 where it is determined whether or not a key object 47 corresponding with one of the ambiguous word objects 108 other than the highest frequency word object 108 is stored in the contextual data table 49. If not, processing returns, as at 608, to the main process at 236 in FIG. 3C.

If it is determined at 612 that a corresponding key object 47 exists, processing continues, as at 616, where the contextual value objects 51 associated with the identified key object 47 are each compared with the stored entry values 53 to identify whether or not any key object 47 and any entry value 53 coincide. If none coincide, processing returns, as at 608, to the main process at 236 in FIG. 3C. However, if it is determined at 616 that a key object 47 and an entry value 53 coincide, then the word object 108 corresponding with the key object 47 is output, as at 620, at a position of priority with respect to the highest-frequency ambiguous word object 108 identified at 604. Processing returns, as at 608, to the main process at 236 in FIG. 3C.

The disambiguation routine 22 additionally is advantageously configured to learn certain contextual data. Specifically, the disambiguation routine 22 can identify the preceding-word type context data when a user on two separate occasions selects a particular less-preferred ambiguous word object 108 in the same context.

For instance, on a first occasion a plurality of ambiguous word objects 108 may be output in response to a first ambiguous input, and a user may select a particular less-preferred ambiguous word object 108. In such a circumstance, the selected less-preferred ambiguous word object 108 and the specific context are stored as an entry in a candidate data file.

If on a second occasion a plurality of ambiguous word objects 108 are output in response to a second ambiguous input, and if the user selects a less-preferred ambiguous word object 108, the less-preferred ambiguous word object 108 and the context are compared with the various entries in the candidate data file. If an entry is found in the candidate data file that matches the less-preferred ambiguous word object 108 and the context of the second ambiguous input, the entry is moved from the candidate data file to the contextual data table 49. The newly stored entry in the contextual data table 49 can thereafter be employed as set forth above.

It is noted however, that the candidate data file is a data buffer of limited capacity. As additional entries are added to the candidate data file, older entries which have not been moved to the contextual data table 49 are deleted on a first-in-first-out basis. The limited size of the candidate data file thus adds to the contextual learning function something of a frequency-of-use limitation. That is, depending upon usage, an entry in the candidate data file can either be moved to the contextual data table 49 or can be removed from the candidate data file to make room for additional entries. If the entry is moved to the contextual data table 49, this would indicate that the user desired the particular less-preferred ambiguous word object 108 in the particular context with sufficient frequency to warrant the saving thereof as valid contextual data. On the other hand, deletion of the candidate entry to make room for additional candidate entries would indicate that the candidate entry was not used with sufficient regularity or frequency to warrant its being saved as learned valid contextual data in the contextual data table 49.

The selected less-preferred ambiguous word object 108 will be stored as a key object 47 in the contextual data table 49 if such a key object 47 does not already exist. Additionally, a hash of the preceding-word context is stored as a contextual value object 51 and is associated with the aforementioned key object 47. In this regard, the preceding-word context might simply be the immediately preceding word. It is understood, however, that the context potentially could be one wherein a particular context word precedes by two, three, or more words the ambiguous word object 108 for which the context is learned. Such context advantageously can be learned for word objects 108 in the new words database 92 and in any other data source in the memory 20. It is also understood that other types of contexts can be learned by the disambiguation routine 22.

Moreover, learned contextual data can be unlearned. For instance, a particular key object 47 and a corresponding particular contextual value object 51 may be added to the contextual data table 49 via the aforementioned learning function. At some point in the future the user may begin in the particular context to prefer an output that had previously been a default output, in favor of which a less-preferred ambiguous word object 108 had been selected on two occasions and became stored as context data. If this happens on two occasions, the previously learned particular key object 47 and corresponding particular contextual value object 51 are advantageously unlearned, i.e., are deleted from the contextual data table 49. That is, the system operates as though the previously learned particular key object 47 and corresponding particular contextual value object 51 were determined to not be valid contextual data. This avoids the use of contextual data that is not desired or that is considered to be invalid.

An improved handheld electronic device 1004 in accordance with another embodiment of the disclosed and claimed concept is depicted generally in FIG. 10. As a general matter, the handheld electronic device 1004 is substantially identical in configuration and function to the handheld electronic device 4, except that the handheld electronic device 1004 employs a multiple-axis input device instead of or in addition to the thumbwheel 32. In the depicted exemplary embodiment, the multiple-axis input device is a track ball 1032 as will be described below. It is noted, however, that multiple-axis input devices other than the track ball 1032 can be employed without departing from the present concept. For instance, other appropriate multiple-axis input devices could include mechanical devices such as joysticks and the like and/or non-mechanical devices such as touch pads, track pads and the like and/or other devices which detect motion or input in other fashions, such as through the use of optical sensors or piezoelectric crystals.

The handheld electronic device 1004 includes a housing 1006 upon which is disposed a processor unit that includes an input apparatus 1008, an output apparatus 1012, a processor 1016, a memory 1020, and a number of routines 1022. All of the operations that can be performed on or with the handheld electronic device 4 can be performed on or with the handheld electronic device 1004. As such, the features of the handheld electronic device 4 that are common with the handheld electronic device 1004, and this would comprise essentially all of the features of the handheld electronic device 4, will generally not be repeated.

The output apparatus 1012 includes a display 1060 that provides visual output. The exemplary output in FIG. 10 is a plurality of icons 1062 that are selectable by the user for the purpose of, for example, initiating the execution on the processor 1016 of a routine 1022 that is represented by an icon 1062.

The input apparatus 1008 can be said to comprise a keypad 1024 and the track ball 1032, all of which serve as input members. The keypad 1024 and the track ball 1032 are advantageously disposed adjacent one another. The keypad 1024 comprises a plurality of keys 1028 that are actuatable to provide input to the processor 1016. Many of the keys 1028 have assigned thereto a plurality of linguistic elements in the exemplary form of Latin letters. Other keys 1028 can have assigned thereto functions and/or other characters.

For instance, one of the keys 1028 is an <ESCAPE> key 1031 which, when actuated, provides to the processor 1016 an input that undoes the action which resulted from the immediately preceding input and/or moves the user to a logically higher position within the logical menu tree managed by a graphical user interface (GUI) routine 1022. The function provided by the <ESCAPE> key 1031 can be used at any logical location within any portion of the logical menu tree except, perhaps, at a home screen such as is depicted in FIG. 10. The <ESCAPE> key 1031 is advantageously disposed adjacent the track ball 1032 thereby enabling, for example, an unintended or incorrect input from the track ball 1032 to be quickly undone, i.e., reversed, by an actuation of the adjacent <ESCAPE> key 1031.

Another of the keys 1028 is a <MENU> key 1033 which, when actuated, provides to the processor 1016 an input that causes the GUI 1022 to generate and output on the display 1060 a menu that is appropriate to the user's current logical location within the logical menu tree. For instance, FIG. 11 depicts an exemplary menu 1035A that would be appropriate if the user's current logical location within the logical menu tree was viewing an email within an email routine 1022. That is, the menu 1035A provides selectable options that would be appropriate for a user given that the user is, for example, viewing an email within an email routine 1022. In a similar fashion, FIG. 12 depicts another exemplary menu 1035B that would be depicted if the user's current logical location within the logical menu tree was within a telephone routine 1022.

The track ball 1032 is disposed on the housing 1006 and is freely rotatable in all directions with respect to the housing 1006. A rotation of the track ball 1032 a predetermined rotational distance with respect to the housing 1006 provides an input to the processor 1016, and such inputs can be employed by the routines 1022, for example, as navigational inputs, scrolling inputs, selection inputs, and other inputs.

For instance, the track ball 1032 is rotatable about a horizontal axis 1034A to provide vertical scrolling, navigational, selection, or other inputs. Similarly, the track ball 1032 is rotatable about a vertical axis 1034B to provide horizontal scrolling, navigational, selection, or other inputs. Since the track ball 1032 is freely rotatable with respect to the housing 1006, the track ball 1032 is additionally rotatable about any other axis (not expressly depicted herein) that lies within the plane of the page of FIG. 10 or that extends out of the plane of the page of FIG. 10.

The track ball 1032 can be said to be a multiple-axis input device because it provides scrolling, navigational, selection, and other inputs in a plurality of directions or with respect to a plurality of axes, such as providing inputs in both the vertical and the horizontal directions. It is reiterated that the track ball 1032 is merely one of many multiple-axis input devices that could be employed on the handheld electronic device 1004. As such, mechanical alternatives to the track ball 1032, such as a joystick, might have a limited rotation with respect to the housing 1006, and non-mechanical alternatives might be immovable with respect to the housing 1006, yet all are capable of providing input in a plurality of directions or along a plurality of axes.

The track ball 1032 additionally is translatable toward the housing 1006, i.e., into the plane of the page of FIG. 10, to provide additional inputs. The track ball 1032 could be translated in such a fashion by, for example, a user applying an actuating force to the track ball 1032 in a direction toward the housing 1006, such as by pressing on the track ball 1032. The inputs that are provided to the processor 1016 as a result of a translation of the track ball 1032 in the indicated fashion can be employed by the routines 1022, for example, as selection inputs, delimiter inputs, or other inputs.

The track ball 1032 is rotatable to provide, for example, navigational inputs among the icons 1062. For example, FIG. 10 depicts the travel of an indicator 1066 from the icon 1062A, as is indicated in broken lines with the indicator 1066A, to the icon 1062B, as is indicated in broken lines with the indicator 1066B, and onward to the icon 1062C, as is indicated by the indicator 1066C. It is understood that the indicators 1066A, 1066B, and 1066C are not necessarily intended to be simultaneously depicted on the display 1060, but rather are intended to together depict a series of situations and to indicate movement of the indicator 1066 among the icons 1062. The particular location of the indicator 1066 at any given time indicates to a user the particular icon 1062, for example, that is the subject of a selection focus of the handheld electronic device 1004. Whenever an icon 1062 or other selectable object is the subject of the selection focus, a selection input to the processor 1016 will result in the routine 1022 or other function represented by the icon 1062 or other selectable object to be executed or initiated.

The movement of the indicator 1066 from the icon 1062A, as indicated with the indicator 1066A, to the icon 1062B, as is indicated by the indicator 1066B, was accomplished by rotating the track ball 1032 about the vertical axis 1034B to provide a horizontal navigational input. As mentioned above, a rotation of the track ball 1032 a predetermined rotational distance results in an input to the processor 1016. In the present example, the track ball 1032 would have been rotated about the vertical axis 1034B a rotational distance equal to three times the predetermined rotational distance since the icon 1062B is disposed three icons 1062 to the right the icon 1062A. Such rotation of the track ball 1032 likely would have been made in a single motion by the user, but this need not necessarily be the case.

Similarly, the movement of the indicator 1066 from the icon 1062B, as indicated by the indicator 1066B, to the icon 1062C, as is indicated by the indicator 1066C, was accomplished by the user rotating the track ball 1032 about the horizontal axis 1034A to provide a vertical navigational input. In so doing, the track ball 1032 would have been rotated a rotational distance equal to two times the predetermined rotational distance since the icon 1062C is disposed two icons 1062 below the icon 1062B. Such rotation of the track ball 1032 likely would have been made in a single motion by the user, but this need not necessarily be the case.

It thus can be seen that the track ball 1032 is rotatable in various directions to provide various navigational and other inputs to the processor 1016. Rotational inputs by the track ball 1032 typically are interpreted by whichever routine 1022 is active on the handheld electronic device 1004 as inputs that can be employed by such routine 1022. For example, the GUI 1022 that is active on the handheld electronic device 1004 in FIG. 10 requires vertical and horizontal navigational inputs to move the indicator 1066, and thus the selection focus, among the icons 1062. If a user rotated the track ball 1032 about an axis oblique to the horizontal axis 1034A and the vertical axis 1034B, the GUI 1022 likely would resolve such an oblique rotation of the track ball 1032 into vertical and horizontal components which could then be interpreted by the GUI 1022 as vertical and horizontal navigational movements, respectively. In such a situation, if one of the resolved vertical and horizontal navigational movements is of a greater magnitude than the other, the resolved navigational movement having the greater magnitude would be employed by the GUI 1022 as a navigational input in that direction to move the indicator 1066 and the selection focus, and the other resolved navigational movement would be ignored by the GUI 1022, for example.

When the indicator 1066 is disposed on the icon 1062C, as is indicated by the indicator 1066C, the selection focus of the handheld electronic device 1004 is on the icon 1062C. As such, a translation of the track ball 1032 toward the housing 1006 as described above would provide an input to the processor 1016 that would be interpreted by the GUI 1022 as a selection input with respect to the icon 1062C. In response to such a selection input, the processor 1016 would, for example, begin to execute a routine 1022 that is represented by the icon 1062C. It thus can be understood that the track ball 1032 is rotatable to provide navigational and other inputs in multiple directions, assuming that the routine 1022 that is currently active on the handheld electronic device 1004 can employ such navigational or other inputs in a plurality of directions, and can also be translated to provide a selection input or other input.

Rotational movement inputs from the track ball 1032 could be employed to navigate among, for example, the menus 1035A and 1035B. For instance, after an actuation of the <MENU> key 1033 and an outputting by the GUI 1022 of a resultant menu, the user could rotate the track ball 1032 to provide scrolling inputs to successively highlight the various selectable options within the menu. Once the desired selectable option is highlighted, i.e., is the subject of the selection focus, the user could translate the track ball 1032 toward the housing 1006 to provide a selection input as to the highlighted selectable option. In this regard, it is noted that the <MENU> key 1033 is advantageously disposed adjacent the track ball 1032. This enables, for instance, the generation of a menu by an actuation the <MENU> key 1033, conveniently followed by a rotation the track ball 1032 to highlight a desired selectable option, for instance, followed by a translation of the track ball 1032 toward the housing 1006 to provide a selection input to initiate the operation represented by the highlighted selectable option.

It is further noted that one of the additional inputs that can be provided by a translation of the track ball 1032 is an input that causes the GUI 1022 to output a reduced menu. For instance, a translation of the track ball 1032 toward the housing 1066 could result in the generation and output of a more limited version of a menu than would have been generated if the <MENU> key 1033 had instead been actuated. Such a reduced menu would therefore be appropriate to the user's current logical location within the logical menu tree and would provide those selectable options which the user would have a high likelihood of selecting. Rotational movements of the track ball 1032 could provide scrolling inputs to scroll among the selectable options within the reduced menu 1035C, and translation movements of the track ball 1032 could provide selection inputs to initiate whatever function is represented by the selectable option within the reduce menu 1032 that is currently highlighted.

By way of example, if instead of actuating the <MENU> key 1033 to generate the menu 1035A the user translated the track ball 1032, the GUI 1022 would generate and output on the display the reduced menu 1035C that is depicted generally in FIG. 13. The exemplary reduced menu 1035C provides as selectable options a number of the selectable options from the menu 1035A that the user would be most likely to select. As such, a user seeking to perform a relatively routine function could, instead of actuating the <MENU> key 1033 to display the full menu 1035A, translate the track ball 1032 to generate and output the reduced menu 1035C. The user could then conveniently rotate the track ball 1032 to provide scrolling inputs to highlight a desired selectable option, and could then translate the track ball 1032 to provide a selection input which would initiate the function represented by the selectable option in the reduced menu 1035C that is currently highlighted.

In the present exemplary embodiment, many of the menus that could be generated as a result of an actuation of the <MENU> key 1033 could instead be generated and output in reduced form as a reduced menu in response to a translation of the track ball 1032 toward the housing 1006. It is noted, however, that a reduced menu might not be available for each full menu that could be generated from an actuation of the <MENU> key 1033. Depending upon the user's specific logical location within the logical menu tree, a translation of the track ball 1032 might be interpreted as a selection input rather than an input seeking a reduced menu. For instance, a translation of the track ball 1032 on the home screen depicted in FIG. 10 would result in a selection input as to whichever of the icons 1062 is the subject of the input focus. If the <MENU> key 1033 was actuated on the home screen, the GUI 1022 would output a menu appropriate to the home screen, such as a full menu of all of the functions that are available on the handheld electronic device 1004, including those that might not be represented by icons 1062 on the home screen.

FIG. 14 depicts a quantity of text that is output on the display 1060, such as during a text entry operation or during a text editing operation, for example. The indicator 1066 is depicted in FIG. 14 as being initially over the letter “L”, as is indicated with the indicator 1066D, and having been moved horizontally to the letter “I”, as is indicated by the indicator 1066E, and thereafter vertically moved to the letter “W”, as is indicated by the indicator 1066F. In a fashion similar to that in FIG. 10, the cursor 1066 was moved among the letters “L”, “I”, and “W” through the use of horizontal and vertical navigational inputs resulting from rotations of the track ball 1032. In the example of FIG. 14, however, each rotation of the track ball 1032 the predetermined rotational distance would move the indicator 1066 to the next adjacent letter. As such, in moving the indicator 1066 between the letters “L” and “I,” the user would have rotated the track ball 1032 about the vertical axis 1034B a rotational distance equal to nine times the predetermined rotational distance, for example, since “I” is disposed nine letters to the right of “L”.

FIG. 15 depicts an output 1064 on the display 1060 during, for example, a text entry operation that employs the disambiguation routine 1022. The output 1064 can be said to comprise a text component 1068 and a variant component 1072. The variant component 1072 comprises a default portion 1076 and a variant portion 1080. FIG. 15 depicts the indicator 1066G on the variant 1080 “HAV”, such as would result from a rotation of the track ball 1032 about the horizontal axis 1034A to provide a downward vertical scrolling input. In this regard, it is understood that a rotation of the track ball 1032 a distance equal to the predetermined rotational distance would have moved the indicator 1066 from a position (not expressly depicted herein) disposed on the default portion 1076 to the position disposed on the first variant 1080, as is depicted in FIG. 15. Since such a rotation of the track ball 1032 resulted in the first variant 1080 “HAV” being highlighted with the indicator 1066G, the text component 1068 likewise includes the text “HAV” immediately preceding a cursor 1084A.

FIG. 16 depict an alternative output 1064A having an alternative variant component 1072A having a default portion 1076A and a variant portion 1080A. The variant component 1072A is horizontally arranged, meaning that the default portion 1076A and the variants 1080A are disposed horizontally adjacent one another and can be sequentially selected by the user through the use of horizontal scrolling inputs, such as by the user rotating the track ball 1032 the predetermined rotational distance about the vertical axis 1034B. This is to be contrasted with the variant component 1072 of FIG. 15 wherein the default portion 1076 and the variants 1080 are vertically arranged, and which can be sequentially selected by the user through the user of vertical scrolling inputs with the track ball 1032.

In this regard, it can be understood that the track ball 1032 can provide both the vertical scrolling inputs employed in conjunction with the output 1064 as well as the horizontal scrolling inputs employed in conjunction with the output 1064A. For instance, the disambiguation routine 1022 potentially could allow the user to customize the operation thereof by electing between the vertically arranged variant component 1072 and the horizontally arranged variant component 1072A. The track ball 1032 can provide scrolling inputs in the vertical direction and/or the horizontal direction, as needed, and thus is operable to provide appropriate scrolling inputs regardless of whether the user chooses the variant component 1072 or the variant component 1072A. That is, the track ball 1032 can be rotated about the horizontal axis 1034A to provide the vertical scrolling inputs employed in conjunction with the variant component 1072, and also can be rotated about the vertical axis 1034B to provide the horizontal scrolling inputs that are employed in conjunction with the variant component 1064A. The track ball 1032 thus could provide appropriate navigational, strolling, selection, and other inputs depending upon the needs of the routine 1022 active at any time on the handheld electronic device 1004. The track ball 1032 enables such navigational, strolling, selection, and other inputs to be intuitively generated by the user through rotations of the track ball 1032 in directions appropriate to the active routine 1022, such as might be indicated on the display 1060. Other examples will be apparent.

It can further be seen from FIG. 16 that the variant component 1072A additionally includes a value 1081 that is indicative of the language into which the disambiguation routine 1022 will interpret ambiguous text input. In the example depicted in FIG. 16, the language is English.

As can be seen in FIG. 17, the value 1081 can be selected by the user to cause the displaying of a list 1083 of alternative values 1085. The alternative values 1085 are indicative of selectable alternative languages into which the disambiguation routine 1022 can interpret ambiguous input. A selection of the value 1081 would have been achieved, for example, by the user providing horizontal scrolling inputs with the track ball 1032 to cause (not expressly depicted herein) the indicator 1066 to be disposed over the value 1081, and by thereafter translating the track ball 1032 toward the housing 1006 to provide a selection input.

The alternative values 1085 in the list 1083 are vertically arranged with respect to one another and with respect to the value 1081. As such, a vertical scrolling input with the track ball 1032 can result in a vertical movement of the indicator 10661 to a position on one of the alternative values 1085 which, in the present example, is the alternative value 1085 “FR”, which is representative of the French language. The alternative value 1085 “FR” could become selected by the user in any of a variety of fashions, such as by actuating the track ball 1032 again, by continuing to enter text, or in other fashions. It thus can be understood from FIG. 16 and FIG. 17 that the track ball 1032 can be rotated to provide horizontal scrolling inputs and, when appropriate, to additionally provide vertical scrolling inputs and, when appropriate, to additionally provide selection inputs, for example.

FIG. 18 depicts another exemplary output on the display 1060 such as might be employed by a data entry routine 1022. The exemplary output of FIG. 18 comprises a plurality of input fields 1087 with corresponding descriptions. A cursor 1084D, when disposed within one of the input fields 1087, indicates to the user that an input focus of the handheld electronic device 1004 is on that input field 1087. That is, data such as text, numbers, symbols, and the like, will be entered into whichever input field 1087 is active, i.e., is the subject of the input focus. It is understood that the handheld electronic device 1004 might perform other operations or take other actions depending upon which input field 1087 is the subject of the input focus.

Navigational inputs from the track ball 1032 advantageously enable the cursor 1084D, and thus the input focus, to be switched, i.e., shifted, among the various input fields 1087. For example, the input fields 1087 could include the input fields 1087A, 1087B, and 1087C. FIG. 18 depicts the cursor 1084D as being disposed in the input field 1087C, indicating that the input field 1087C is the subject of the input focus of the handheld electronic device 1004. It is understood that the cursor 1084D, and thus the input focus, can be shifted from the input field 1087C to the input field 1087A, which is disposed adjacent and vertically above the input field 1087C, by providing a vertical scrolling input in the upward direction with the track ball 1032. That is, the track ball 1032 would be rotated the predetermined rotational distance about the horizontal axis 1034. Similarly, the cursor 1084D, and thus the input focus, can be shifted from the input field 1087A to the input field 1087B, which is disposed adjacent and to the right of the input field 1087A, by providing a horizontal scrolling input to the right with the track ball 1032. That is, such a horizontal scrolling input could be provided by rotating the track ball the predetermined rotational distance about the vertical axis 1034B. It thus can be seen that the track ball 1032 is rotatable in a plurality of directions about a plurality axes to provide navigational, scrolling, and other inputs in a plurality of directions among a plurality of input fields 1087. Other types of inputs and/or inputs in other applications will be apparent.

Since the keypad 1024 and the track ball 1032 are advantageously disposed adjacent one another, the user can operate the track ball 1032 substantially without moving the user's hands away from the keypad 1024 during a text entry operation or other operation. It thus can be seen that the track ball 1032 combines the benefits of both the thumbwheel 32 and the <NEXT> key 40. It is noted, however, that other embodiments of the handheld electronic device 1004 (not expressly depicted herein) could include both the track ball 1032 and a <NEXT> key such as the <NEXT> key 40 without departing from the present concept.

An improved handheld electronic device 2004 in accordance with still another embodiment of the disclosed and claimed concept is depicted generally in FIG. 19 and FIG. 20. The handheld electronic device 2004 includes a housing 2006 upon which is disposed a processor unit that includes an input apparatus 2008, an output apparatus 2012, a processor 2016, a memory 2020, and a number of routines 2022. All of the operations that can be performed on or with the handheld electronic devices 4 and/or 1004 can be performed on or with the handheld electronic device 2004. As such, the features of the handheld electronic device 2004 that are common with the handheld electronic devices 4 and/or 1004, and this would comprise essentially all of the features of the handheld electronic devices 4 and/or 1004, will generally not be repeated.

As a general matter, the handheld electronic device 2004 is substantially identical in configuration and function to the handheld electronic device 1004, except that the handheld electronic device 2004 includes a touch screen display 2055 that provides a non-mechanical multiple-axis input device 2032 instead of the track ball 1032. The multiple-axis input device 2032 can be said to be in the form of a virtual track ball 2032.

As is generally understood, the touch screen display 2055 includes a liquid crystal layer between a pair of substrates, with each substrate including an electrode. The electrodes form a grid which defines the aperture size of the pixels. When a charge is applied to the electrodes, the liquid crystal molecules of the liquid crystal layer become aligned generally perpendicular to the two substrates. A display input/output subassembly 2053 of the output apparatus 2012 controls the location of the charge applied to the electrodes thereby enabling the formation of images on the touch screen display 2055.

Additionally, the touch screen display 2055 comprises a sensor assembly 2057 which comprises an output device 2059 and a plurality of detectors 2061. The detectors 2061 are shown schematically and are typically too small to be seen by the naked eye. Each detector 2061 is in electrical communication with the output device 2059 and creates an output signal when actuated. The detectors 2061 are disposed in a pattern, discussed below, and are structured to detect an external object immediately adjacent to, or touching, the touch screen display 2055. The external object is typically a stylus or a user's finger (not shown). The output device 2059 and/or the processor 2016 are structured to receive the detector signals and convert the signals to data representing the location of the external object relative to the touch screen display 2055. As such, while the sensor assembly 2057 is physically a component of the touch screen display 2055, it is nevertheless considered to be a logical component of the input apparatus 2008 since it provides input to the processor apparatus.

The detectors 2061 are typically capacitive detectors, optical detectors, resistive detectors, or mechanical detectors such as strain gauge or charged grid, although other technologies may be employed without departing from the present concept. Typically, capacitive detectors are structured to detect a change in capacitance caused by the electrical field of the external object or a change in capacitance caused by the compression of the capacitive detector. Optical detectors are structured to detect a reflection of light, e.g., light created by the touch screen display 2055. Mechanical detectors include a charged grid with columns that would be disposed on one side of the touch screen display 2055 and a corresponding grid without columns would be disposed at another location on the touch screen display 2055. In such a configuration, when the touch screen display 2055 is compressed, i.e. as a result of being touched by the user, the columns at the area of compression contact the opposing grid thereby completing a circuit.

Capacitive detectors may be disposed upon either substrate and, although small, require space. Thus, and any pixel that is disposed adjacent a detector 2061 will have a reduced size, or aperture, to accommodate the adjacent detector 2061.

The detectors 2061 are disposed in a pattern, and at least some of the detectors 2061 preferably are arranged in lines that form a grid. A first portion of the detectors 2061 are disposed on a first area 2081 of the touch screen display 2055, and a second portion of the detectors 2061 are disposed on a second area 2083 of the touch screen display 2055. As can be seen from FIG. 19, the first area 2081 essentially is every region of the touch screen display 2005 other than the second area 2083.

The first portion of the detectors 2061 disposed on the first area 2081 of the touch screen display 2055 are disposed in a relatively sparse pattern in order to minimize the visual interference that is caused by the presence of the detectors 2061 adjacent the pixels. Preferably, the spacing of the detectors 2061 on the first area 2081 is between about 1.0 mm and 10.0 mm between the detectors 2061, and more preferably about 3.0 mm between the detectors 2061.

The second portion of the detectors 2061 are disposed in a relatively dense pattern on the second area 2083 of the touch screen display 2055 and are structured to support the function of the virtual track ball 2032. The image quality in the second area 2083 of the touch screen display 2055 is adversely affected due to the dense spacing of the detectors 2061 there. However, the second area 2083 is a relatively small area compared to the entire touch screen display 2055. Preferably, the density of the detectors 2061 in the second area 2083 is between about 0.05 mm and 3.0 mm between the detectors, and more preferably about 0.1 mm between the detectors 2061. Further, because the pixels in the second area 2083 are dedicated for the virtual track ball 2032, it is acceptable to have a reduced pixel density with larger pixels. Since the pixel size would be very large, the aspect ratio would be significantly higher than that of pixels that are not disposed adjacent a detector 2061. The pixels in the second area 2083 likely would be special function pixels, such as pixels that would both depict the virtual track ball 2032 and that would light up the second area 2083 to highlight the virtual track ball 2032.

The processor apparatus is structured to create images and define the boundaries of selectable portions of the images on the touch screen display 2055. For example, the processor apparatus will create the images of selectable icons or other objects on specific portions of the touch screen display 2055. The processor apparatus is further structured to relate specific detectors 2061 to the specific portions of the touch screen display 2055. Thus, when the processor apparatus detects the actuation of a specific detector 2061 adjacent to a specific image, e.g. a selectable icon, the processor apparatus will initiate the function or routine related to that icon, e.g. opening a calendar program.

Similarly, the processor apparatus is structured to employ specific detectors 2061 to support the function of the virtual track ball 2032 in the second area 2083 of the touch screen display 2055. Thus, actuations of one or more of the detectors 2061 that support the virtual track ball 2032 will be interpreted by the processor apparatus as being inputs from the virtual track ball 2032. For instance, an actuation of a sequential plurality of detectors 2061 extending along a particular direction on the touch screen display 2055 in the second area 2083 might be interpreted as a navigational input, a scrolling input, a selection input, and/or another input in the particular direction. Since the user can freely move a finger, for instance, in any direction on the touch screen display 2055, the virtual track ball 2032 is a multiple-axis input device. Other inputs, such as a non-moving actuation of one or more detectors 2061 in the central region of the virtual track ball 2032 could be interpreted by the processor apparatus as an actuation input of the virtual track ball 2032, such as would be generated by an actuation of the track ball 1032 of the handheld electronic device 1004 in a direction toward the housing 1006 thereof. It can be understood that other types of actuations of the detectors 2061 in the second area 2083 can be interpreted as various other inputs without departing from the disclosed and claimed concept.

The handheld electronic device 2004 thus comprises a multiple-axis input device 2032 that is non-mechanical but that still provides the same functional features and advantages as, say, the track ball 1032 of the handheld electronic device 1004. It is understood that the virtual track ball 2032 is but one example of the many types of multiple-axis input devices that could be employed on the handheld electronic device 2004.

While specific embodiments of the disclosed and claimed concept have been described in detail, it will be appreciated by those skilled in the art that various modifications and alternatives to those details could be developed in light of the overall teachings of the disclosure. Accordingly, the particular arrangements disclosed are meant to be illustrative only and not limiting as to the scope of the disclosed and claimed concept which is to be given the full breadth of the claims appended and any and all equivalents thereof. 

1-10. (canceled)
 11. A method of enabling input into a handheld electronic device that comprises a processor and a memory storing a plurality of language objects and contextual data, the method comprising: detecting a first input as a first language object; detecting an input comprising one or more key selections as a second input; outputting, as proposed interpretations of the second input, at least a portion of a particular language object and at least a portion of an another language object; detecting a selection of the portion of the particular language object; locating an entry in a data file comprising a contextual value object that corresponds with the first language object, wherein the contextual value object is associated with a key object that corresponds with the another language object; and removing the entry from the data file.
 12. The method of claim 11, wherein the contextual value object is associated with the key object based on the key object occurring at a statistically significant incidence with the another language object.
 13. The method of claim 11, further comprising detecting an input from a touch screen display as the selection of the portion of the particular language object.
 14. The method of claim 11, wherein the contextual value object is a representation of the first language object.
 15. The method of claim 14, wherein the representation is a hash of the first language object.
 16. The method of claim 11, wherein the key object is stored as a hash value.
 17. The method of claim 11, wherein the contextual value object is a punctuation symbol.
 18. The method of claim 11, wherein the contextual value object comprises a representation of a numerically-indicated date format.
 19. The method of claim 11, wherein the contextual value comprises a particular word.
 20. A handheld electronic device comprising: a processor and a memory storing a plurality of language objects and contextual data and a number of routines which, when executed by the processor, cause the electronic device to be configured to perform operations comprising: detecting a first input as a first language object; detecting an input comprising one or more key selections as a second input; outputting, as proposed interpretations of the second input, at least a portion of a particular language object and at least a portion of an another language object; detecting a selection of the portion of the particular language object; locating an entry in a data file comprising a contextual value object that corresponds with the first language object, wherein the contextual value object is associated with a key object that corresponds with the another language object; and removing the entry from the data file.
 21. The device of claim 20, wherein the contextual value object is associated with the key object based on the key object occurring at a statistically significant incidence with the another language object.
 22. The device of claim 20, the operations further comprising detecting an input from a touch screen display as the selection of the portion of the particular language object.
 23. The device of claim 20, wherein the contextual value object is a representation of the first language object.
 24. The device of claim 23, wherein the representation is a hash of the first language object.
 25. The device of claim 20, wherein the key object is stored as a hash value.
 26. The device of claim 20, wherein the contextual value object is a punctuation symbol.
 27. The device of claim 20, wherein the contextual value object comprises a representation of a numerically-indicated date format.
 28. The device of claim 20, wherein the contextual value comprises a particular word. 